GEODE-9145: update CODEOWNERS (#6316)
GEODE-9145: update CODEOWNERS (#6316)

Removing myself from CODEOWNERS as I'm retiring soon and shouldn't be
blocking any pull requests.  Ernie & Bill are taking my place for now.
jdeppe-pivotal/geode,jdeppe-pivotal/geode,smgoller/geode,jdeppe-pivotal/geode,masaki-yamakawa/geode,masaki-yamakawa/geode,masaki-yamakawa/geode,smgoller/geode,jdeppe-pivotal/geode,smgoller/geode,jdeppe-pivotal/geode,smgoller/geode,masaki-yamakawa/geode,masaki-yamakawa/geode,smgoller/geode,smgoller/geode,masaki-yamakawa/geode,jdeppe-pivotal/geode,smgoller/geode,jdeppe-pivotal/geode,masaki-yamakawa/geode